You are currently viewing a snapshot of www.mozilla.org taken on April 21, 2008. Most of this content is highly out of date (some pages haven't been updated since the project began in 1998) and exists for historical purposes only. If there are any pages on this archive site that you think should be added back to www.mozilla.org, please file a bug.

Skip to main content

You are here: Known Vulnerabilities in Mozilla Products (Firefox 2.0.0.2) > MFSA 2007-09

Mozilla Foundation Security Advisory 2007-09

Title: Privilege escalation by setting img.src to javascript: URI
Impact: Critical
Announced: March 5, 2007
Reporter: moz_bug_r_a4
Products: Firefox 1.5.0.9/2.0.0.1, SeaMonkey 1.0.7

Fixed in: Firefox 2.0.0.2
  Firefox 1.5.0.10
  SeaMonkey 1.1.1
  SeaMonkey 1.0.8

Description

moz_bug_r_a4 reports that the fix for MFSA 2006-72 in Firefox 1.5.0.9 and Firefox 2.0.0.1 introduced a regression that allows scripts from web content to execute arbitrary code by setting the src attribute of an IMG tag to a specially crafted javascript: URI.

The same regression also caused javascript: URIs in IMG tags to be executed even if JavaScript execution was disabled in the global preferences. This facet was noted by moz_bug_r_a4 and reported independently by Anbo Motohiko.

Thunderbird is not affected by this flaw as it will not execute javascript: URIs in IMG tags.

Workaround

Upgrade to a version containing the fix. Disabling JavaScript does not protect against this flaw.

References